body{
    font-family: tahoma, arial, "Hiragino Sans GB", 宋体, sans-serif;
}

#top{
    width: 100%;
    height: 60px;
    background: #2b669a;
    margin-bottom: 30px;
}

#top>.container{
    height: 100%;
}

#top-wrap{
    width: 100%;
    height: 100%;
    line-height: 100%;
    vertical-align: middle;
    display: inline-flex;
    position: relative;
}

#page-title{
    display: inline-block;
}

#page-title>a{
    height: 40px;
    margin: 10px;
    display: inline-block;
    color: white;
    font-weight: bolder;
    font-size: 30px;
    line-height: 40px;
    text-align: center;
    font-family: "微软雅黑 Light", serif;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

#page-title>a:hover,#page-title>a:active,#page-title>a:focus{
    text-decoration: none;
}

#top-menu{
    height: 100%;
    display: inline-block;
    list-style: none;
    margin: 0 0 0 150px;
    padding: 0;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

#top-menu>li{
    height: 100%;
    text-align: center;
    line-height: 60px;
    display: inline-block;
    margin: 0 25px;
    cursor: pointer;
    color: white;
    font-size: 16px;
    position: relative;
}

#top-menu>li::after{
    content: "";
    width: 0;
    height: 0;
    visibility: hidden;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 10px solid white;
    position: absolute;
    bottom: 0;
    right: 50%;
    margin-right: -10px;
}

#top-menu>.active::after{
    visibility: visible;
}

#top-search{
    position: absolute;
    right: 0;
    top: 50%;
    margin-top: -17.4px;
}

#top-input-search{
    width: 300px;
    display: inline-block;
}

#top-btn-search{
    display: inline-block;
}

.page{
    width: 100%;
    visibility: hidden;
    display: none;
}

.my-active{
    display: block;
    visibility: visible;
}







#second-main{
    height: 700px;
    background: blue;
}

#third-main{
    height: 2000px;
    background: yellow;
}


